Drier.



`F. l. BOWMAN..

DHIER.

APPLICATION FILED FEB. 24. |914.

1,265,298. Patented May 7, 1918.

.IIN

FREDERICK JOSEPH BOWMAN, or oLEvELANnoHIo.

' To all whom t may concern DRIER.

Be it known that I, FREDERICK JOSEPH BowMAN, a citizen of the United States,

vand resident of Cleveland, in the county v,of Cuyahoga and State of'Ohio, have 1nvented certain new and useful Improvements in Driel-s, of which I hereby declare the following to be a full, clear, and exact description, such as will enable others skilled in the art to'which it appertains to make and use the same.

The objects of the invention are to provide an automatically acting drying machine for such materials as sand, `pulverized powdered ores, coal, malt, etc., in which device the finely divided particles of dust lwhich are ordinarily dissipated andlost are depositedL in separate compartments where they can be collected and so prevent the waste of a large percentageof the material which in the case of valuable ores provides a most desirable saving.

The invention comprises a vertical tower or enlarged flue' upwardly through which heated air passes under an induced draft, and into which the material to be dried falls by gravity. The interior of this tower is provided with receiving devices for arrest-l` ing the upward current of air, the same devices being so constructed and arranged as to retard and widely distribute the falling material, and to constantly redistribute the same so that it will fall from one receiverto the other, and every particle will be exposed on all sides to the heating influence of the column of hotair rising through said tower and to the contact ofthe surface of each receiver, thus permitting the moisture to be .conveyed away from it by the current of air.

The invention also includes means 'for collecting the dust which'forms at the top of kthe tower so `that it can be recovered `and re* turned to the drier,y and passed again through the tower for treatment.'

The invention consistsk inthe construction cfr-inclinedk receivinglplates or bars spaced in staggered relation to eachother in the tower, in means for producing a rising current of hot air in theftower, andfin means for moistening and collecting the fine parl ticles of dust for return to the tower, and further consists in thecombination and arrangement of parts and construction of deteils .aS-hereinafter described, shown in the Specification of Letters latent.

Patented May 7, 1918.

Application filed February 24, 1914. Serial No. 820,410.

' accompanying drawings l and specifically pointed out yin the claim.

In the accompanying drawings Figure 1 is a vertical section of the drier; Fig. 2 is a similar 'section through the drier and v dust collecting device; Fig. 3 is an enlarged vertical section of a portion of the drier; and Fig. 4 is a plan view of the same.

In these views l is the-'tower preferably iof rectangular shape and 2, 2, are transverse angle bars secured in the wall at their endsas shown in Fig. 3 and arranged therein 1n staggered relation to each other as shown in Fig. 2, in rows, and spaced from each other. Y

These rows of bars extend from the top to the bottom of the tower and upon these bars preferably at right angles, are placed angle plates 3, 3 which extend from wall to wall. The half-bars or half-angles which are shown as touching the wall in every other row are inclined away from the wall, in this way preventing any appreciable contact between the material and the wall which might lead to the sticking of the material thereto. A The upper bars are preferably of larger size than the 'supporting bars therefor and are also arranged in staggered relation to each other. Q

l At the top of the tower is shown a hopper 4 which discharges the moist material into the tower by means of a feed screw 5 where lit Yfalls upon the first layer of angled cross sliding down the'inclined surfaces of the bars from the lower edge of one series to vthe upper edge of the next series below until the material Yhas traversed the entire length of the tower.

The inverted angle plates provide pockets in which the hot air is temporarily retained and which tend to prevent the too rapid circulation of hot air and apply it directly to the thin sheets of material falling over` recurs with every layer of bars, and the staggered relation of the angle plates causes the material to fall from one bar onto the one below and to be redistributed as it passes over the edges of each set or layer of bars, so that by the time the material has arrived at the bottom of the tower all moisture has been extracted therefrom and is carried upward by the column of air which has absorbed it.

The air is preferably heated by means of a muiiier 8 placed upon the furnace '9 at one side of the lower end of 'the flue. rlhe iiue which carries away the products of combustion rises at 10 alongside of the tower, but with some products such as sand which will not be injured by contact with the products of combustion, the furnace draft can pass directly through the tower if desired.

The dried material falls through a chute 6 at the lower end of the tower which is controlled by means of the hinged lvalve 7 which is moved by the material in passing but which automatically closes to prevent l cold air from entering from below.

The vertical draft through the tower is accelerated by means of a blower 11 located at the top of the stack and this blower draws out the moistened air including the particles of dust which are too fine to settle by gravity upon the bars. To preserve this dust which in the case of some ores is too valuable to waste, the current of vapor mingled with dust is discharged through downwardly inclined conduit pipes 12, 12, into collecting chambers 13, 13.

The vapor commingled with the dust condenses and the dust absorbs the vapor and is deposited upon the walls of the pipes `in the form of soft mud and slides down into the first chamber. After leaving these collecting chambers the current of vapor is conducted through a pipe P into a vertical pipe P the mouth of which extends slightly below the surface of a tank T containing water, yand bubbles to the surface, thus forming a trap which strains outevery particle of dust that may remain, and `the minutest particle or mote of the material is preserved permitting only the vapor to escape. i

The moisture formed by condensation 'of the vapor assists in washing it out of the conduit. The conduit is preferably constructed of vitriied material having a smooth inner surface adapted to assist in the movement of the moistened masses. The conduit is usually constructed of a series of straight 'sewer pipe, each vhaving an offset or Y communicating therewith. These Ys Uapiea of this patent may be obtained for ve cents each, by addressing the Gommissioner Washington, LD. C.

are provided with removable covers or heads 14, 14, which permit access to the interior of the pipes in case there should be any stoppage and kcollection of the material therein and so that the conduit can be cleaned.

Following the first collecting chamber are a series of similar chambers 13, 13,k separated by means of baflie walls '15, 15, which become wet by the condensation of the vapor and any dust that has not been deposited in the first compartment will be collected upon the baffle wallsand side walls of the chambers.

- The walls of these chambers are preferably lined with glazed tile so that the moistened dust will flow downward upon them.

After the collecting chambers are filled or a sufficient amount of moist material is deposited therein, it is removed through doors D, D, D, in the side walls thereof, and is returned to the main fine for drying.

In this manner the most finely powdered ores and other materials can be dried without loss of any of their finest particles, and the vapor escaping from the chambers and tanlrwill be free from all dust and deposit.

In Fig. 3 brace bars A connect the sides of the angles 3.

The device described above has been given a thorough test and has been found to be practical and eiicient and the vapor escaping at the end is as free from dust as the exhaust from a steam engine.

Having described the invention what I claim as new and desire to secure by Letters Patent is:

In ya drier, in combination, a vertical tower, means for heating the air supplied thereto, lseries of distributing devices spaced apart in said flue, each series comprising parallel spaced angle plates having the apex 0f the angles projecting upward, the plates in each series bearing a staggered relation to vthe plates in adjacent series, some yof the series of plates terminating in inclined end plates resting against the walls of said tower, a blower for exhausting the air from said tower, a downwardly extending conduit into which said blower discharges the rair from said tower, a. settling tank for ythe fine ma.- terial discharged from said pipe, and a trap for the air discharged from said tank.

In testimony whereof, I hereunto setA my hand this 26th day of January 1914.

n FREDERICK JOSEPH BOWMJAN. e. In presence of- CHAS. H. OLDs,

WM. M. MONROE.

@f Param. 

